Cannon powered by printed spring & cannonball
thingiverse
The cannon contains a 3D printed spring. It is able to fire a cannonball a few meters. The included cannonball is perfectly rounded, which is achieved by dividing it into 3 parts (2 hemispheres and peg). I've printed it from PETG with 15% infill. PETG is recommended, but PLA or other material should be suitable as well, but PLA should be printed rather with 100% infill (see comments). It's designed to be printed without any supports. It was constructed in Fusion by my 12 years old son :)
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